<template>
    <div class="numberPad">
        <div class="output">{{output || '0' }}</div>
        <div class="buttons">
            <button @click="inputContent">1</button>
            <button @click="inputContent">2</button>
            <button @click="inputContent">3</button>
            <button @click="remove">删除</button>
            <button @click="inputContent">4</button>
            <button @click="inputContent">5</button>
            <button @click="inputContent">6</button>
            <button @click="Clear">清空</button>
            <button @click="inputContent">7</button>
            <button @click="inputContent">8</button>
            <button @click="inputContent">9</button>
            <button class="ok" @click="ok">OK</button>
            <button class="zero" @click="inputContent">0</button>
            <button @click="inputContent">.</button>
        </div>
    </div>
</template>

<script lang="ts">
    import Vue from 'vue';
    import {Component} from 'vue-property-decorator';

    @Component

    export default class NumberPad extends Vue {
        output='0';

        inputContent(event: MouseEvent) {
            const button = (event.target as HTMLBaseElement);
            const input = button.textContent!;
            if (this.output.length === 14) {return;}

            if (this.output === '0') {
                if ('0123456789'.indexOf(input) >= 0) {
                    this.output = input;
                } else {
                    this.output += input
                }
                return;
            }

            if (this.output.indexOf('.') >= 0 && input === '.') {return;
            }
            this.output += input
            }
        remove(){
            if (this.output.length===1){
                this.output='0'
            }else {
            this.output=this.output.slice(0,-1);
            }
        }
        Clear(){
            this.output='0'
        }
        ok(){
            const number=parseFloat(this.output)
            this.$emit('update:value', number);
            this.$emit('submit', number);
            this.output='0'
        }
    }
</script>

<style lang="scss" scoped>
    @import "~@/assets/style/helper.scss";
    .numberPad {
        .output {
            @extend %clearFix;
            @extend %innerShadow;
            font-size: 36px;
            font-family: Consolas, monospace;
            padding: 9px 16px;
            text-align: right;
            height: 70px;
        }
        .buttons {
            @extend %clearFix;
            > button {
                width: 25%;
                height: 64px;
                float: left;
                background: transparent;
                border: none;
                &.ok {
                    height: 64*2px;
                    float: right;
                }
                &.zero {
                    width: 25*2%;
                }
                $bg: #f2f2f2;
                &:nth-child(1) {
                    background: $bg;
                }
                &:nth-child(2), &:nth-child(5) {
                    background: darken($bg, 4%);
                }
                &:nth-child(3), &:nth-child(6), &:nth-child(9) {
                    background: darken($bg, 4*2%);
                }
                &:nth-child(4), &:nth-child(7), &:nth-child(10) {
                    background: darken($bg, 4*3%);
                }
                &:nth-child(8), &:nth-child(11), &:nth-child(13) {
                    background: darken($bg, 4*4%);
                }
                &:nth-child(14) {
                    background: darken($bg, 4*5%);
                }
                &:nth-child(12) {
                    background: darken($bg, 4*6%);
                }
            }
        }
    }
</style>